<template>
    <div class="login_container">
        <div class="login_box">
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <el-form label-width="80px" class="login_form" ref="loginFormRef" :model="loginForm" :rules="loginFormRules">
                <el-form-item label="账号" prop="username">
                    <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
                </el-form-item>
                <el-form-item label="密码" prop="password">
                    <el-input prefix-icon="el-icon-unlock" v-model="loginForm.password" type="password"></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        name: "Login",
        data(){
            return{
                loginForm:{
                    username: '',
                    password: ''
                },
                loginFormRules:{//验证规则
                    username: [
                        {required: true, message: '请输入用户名', trigger: 'blur'},
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    password: [
                        {required: true, message: '请输入密码', trigger: 'blur'},
                        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                    ]
                }
            }
        },
        methods:{
            //重置按钮
            resetLoginForm(){
                this.$refs.loginFormRef.resetFields();
            },
            //登录按钮
            login(){
                this.$refs.loginFormRef.validate(async valid => {
                    if(!valid) return;
                    const {data: res} = await this.$http.post('login', this.loginForm);
                    if(res.meta.status !== 200) return this.$message.error('登录失败！');
                    this.$message.success('登录成功~');
                    //1.将登录成功之后的 token ，保存到客户端的 sessionStorage 中
                    //  1.1项目中除了登录之外的API接口，必须在登录之后才能访问
                    //  1.2 token只应在当前网站打开期间生效，所以将token保存再sessionStorage中
                    window.sessionStorage.setItem('token', res.data.token);
                    //2.通过编程式导航跳转到后台主页，路由地址是/home
                    this.$router.push('/home');

                })
            }
        }
    }
</script>

<style lang="less" scoped>
    .login_container{
        background: #2b4b6b;
        height: 100%;
    }
    .login_box{
        width: 450px;
        height: 300px;
        background: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);

        .avatar_box{
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%);
            background: #fff;
            img{
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background: #eee;
            }
        }
    }
    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .btns{
        display: flex;
        justify-content: flex-end;
    }
</style>
